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java.lang.AssertionError: Unknown credential type configured: null	at jenkins.plugins.openstack.compute.JCloudsSlaveTemplate.get(	at jenkins.plugins.openstack.compute.JCloudsSlaveTemplate.provisionSlave(	at jenkins.plugins.openstack.compute.JCloudsCloud$	at jenkins.plugins.openstack.compute.JCloudsCloud$	at jenkins.util.ContextResettingExecutorService$	at	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at